update readme

Author: dchaofei

README.md

@@ -87,6 +87,11 @@ make install
 make test
 ```
 
+## QA
+- wechaty-puppet-service: WECHATY_PUPPET_SERVICE_TOKEN not found ? 
+  - go-wechaty 是 [wechaty](https://github.com/wechaty/wechaty)(TypeScript) 的 go 语言实现，启动 wechaty 需要 puppet，但目前已知 puppet 都是使用 TypeScript 语言编写，为了能让 go-wechaty 使用这些 puppet，我们可以使用 wechaty-gateway 把 puppet 转换为 grpc 服务，让 go-wechaty 去连接 grpc 服务，go-wechaty -> wechaty-gateway -> puppet，文档: https://wechaty.js.org/docs/puppet-services/diy/
+  - puppet list: https://wechaty.js.org/docs/puppet-providers/  
+
 ## See Also
 
 - [Learn Go in 12 Minutes](https://www.youtube.com/watch?v=C8LgvuEBraI)